使用數位影像進行振動台試驗之動態量測

Application of Digital Image on Dynamic Measurement in Shake Table Test

本文使用數位攝影機配合影像處理技術對振動台試驗之量測進行研究，透過非接觸量測方式可將儀器本身對試驗的影響降至最低。近年來數位技術解析度已足夠用來量測一般變位，搭配自動化程式進行讀點，可避免人工讀點導致的誤差及節省時間。研究結果顯示本方法之量測距離不若傳統之位移計有其限制，且不限於單一方向之量測，只要在試驗過程中拍攝，經處理後即可取代多組位移計及加速度計，此外亦可進行邊坡角度之量測，因此利用本方法來進行振動台動態量測會較傳統方法來得簡單且多樣化。本文亦對振動台試驗中之量測結果與承受振動之壁體彎曲變形理論進行比較，結果尚稱一致。

A newly developed non-touch system accompanied by digital camera technique and image processing in the present study can reduce the influence of testing apparatus on experimental results. In recent years the precision of digital technology has constantly risen and digital instruments measure deformation well. This system run by an auto computer program, can prevent reading errors originating from equipment operators and minimize running time. The results reveal that the system can measure better than conventional displacement gauges, and it has the advantage of replacing multiple-gauges and can use various direction measurements. After successfully applying the system slope measurement, further applications of the system will be more versatile and simpler. The testing results in the laboratory are in accordance with those of the flexural wall theory due to cyclic loading.